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      <i class="fa fa-calendar"></i>2019-06-21
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       | <i class="fa fa-calendar"></i>更新时间:2020-12-8 9:23 
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  <h1 class="passage-title">
    前端关于数据处理的相关参考
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    <h2 id="数组去除符合条件的子元素"><a href="#数组去除符合条件的子元素" class="headerlink" title="数组去除符合条件的子元素"></a>数组去除符合条件的子元素</h2><blockquote>
<p>如果直接使用 for 循环去除，那么会出现错误，原因是函数在不断的去除，而索引没变</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">var arr = [0,1,2,3,4,5,1,2,3]</span><br><span class="line">for (let i=0;i&lt;arr.length;i++) &#123;</span><br><span class="line">    if(arr[i] == 2)&#123;</span><br><span class="line">        arr.splice(i--,1)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="JS-浮点数精确度问题"><a href="#JS-浮点数精确度问题" class="headerlink" title="JS 浮点数精确度问题"></a>JS 浮点数精确度问题</h2><p>当js进行浮点型计算的时候，会导致计算出错。例：0.69<em>10=6.8999999999999995<br>因为js作为解释性语言，同其他语言一样在计算小数的时候将小数转二进制不好转换<br>解决办法：将小数转换成整数，计算完成后转换成小数。0.69</em>100*10/100</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">//处理数字后两位（四舍五入）</span><br><span class="line">5.324.toFixed(2)==5.32</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h2 id="数字转成每隔3位加逗号"><a href="#数字转成每隔3位加逗号" class="headerlink" title="数字转成每隔3位加逗号"></a>数字转成每隔3位加逗号</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">var num_s = &quot;1232134456.546 &quot;;</span><br><span class="line">var num=parseFloat(num_s).toLocaleString();</span><br></pre></td></tr></table></figure>

<h3 id="本地时间规则化"><a href="#本地时间规则化" class="headerlink" title="本地时间规则化"></a>本地时间规则化</h3><pre><code>new Date.toLocaleTimeString()
// 下午 2:30:12
</code></pre>
<h3 id="获取当前时间及前半个小时"><a href="#获取当前时间及前半个小时" class="headerlink" title="获取当前时间及前半个小时"></a>获取当前时间及前半个小时</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">var a= new Date();</span><br><span class="line">var y=a.getFullYear();</span><br><span class="line">var m=a.getMonth()+1;</span><br><span class="line">var d=a.getDate();</span><br><span class="line">var h=a.getHours();</span><br><span class="line">var f=a.getMinutes();</span><br><span class="line">h&lt;10?h=&quot;0&quot;+h:h=h;</span><br><span class="line">f&lt;10?f=&quot;0&quot;+f:f=f;</span><br><span class="line">$scope.end_time=y+&quot;-&quot;+m+&quot;-&quot;+d+&quot; &quot;+h+&quot;:&quot;+f</span><br><span class="line">var b= new Date(a.getTime()-1000*60*30);</span><br><span class="line">y=b.getFullYear();</span><br><span class="line">m=b.getMonth()+1;</span><br><span class="line">d=b.getDate();</span><br><span class="line">h=b.getHours();</span><br><span class="line">f=b.getMinutes();</span><br><span class="line">$scope.start_time=y+&quot;-&quot;+m+&quot;-&quot;+d+&quot; &quot;+h+&quot;:&quot;+f</span><br></pre></td></tr></table></figure>

<h3 id="CONSOLE-信息集"><a href="#CONSOLE-信息集" class="headerlink" title="CONSOLE 信息集"></a>CONSOLE 信息集</h3><p>可用于信息提示 </p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"># 输出信息</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;文字信息&#x27;</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">info</span>(<span class="string">&#x27;提示信息&#x27;</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">warn</span>(<span class="string">&#x27;警告信息&#x27;</span>);</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">error</span>(<span class="string">&#x27;错误信息&#x27;</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 当第一参数为false时，输出警告信息第二参数</span></span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">assert</span>(<span class="literal">true</span>,<span class="string">&#x27;看不见&#x27;</span>)</span><br><span class="line"></span><br><span class="line"><span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">Error</span>(<span class="string">&#x27;这是一个错误提示&#x27;</span>);</span><br><span class="line"><span class="keyword">throw</span> &#123; <span class="attr">name</span>: <span class="string">&#x27;参数错误&#x27;</span>, <span class="attr">message</span>: <span class="string">&#x27;data[0]不存在&#x27;</span>&#125;</span><br><span class="line"></span><br><span class="line"># 输出样式 （<span class="variable constant_">IE</span> 不支持）</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&quot;%c我要变色了&quot;</span>,<span class="string">&quot;color:blue;font-size:20px&quot;</span>)</span><br></pre></td></tr></table></figure>

<blockquote>
<p>分组输出</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">/*可折叠*/</span><br><span class="line">console.group(&#x27;第一个组&#x27;);</span><br><span class="line">    console.log(&quot;1-1&quot;);</span><br><span class="line">    console.log(&quot;1-2&quot;);</span><br><span class="line">    console.log(&quot;1-3&quot;);</span><br><span class="line">console.groupEnd();</span><br><span class="line">/*可嵌套*/</span><br><span class="line">console.group(&#x27;第一个组&#x27;);</span><br><span class="line">    console.group(&quot;1-1&quot;);</span><br><span class="line">        console.group(&quot;1-1-1&quot;);</span><br><span class="line">            console.log(&#x27;内容&#x27;);</span><br><span class="line">        console.groupEnd();</span><br><span class="line">    console.groupEnd();</span><br><span class="line">    console.group(&quot;1-2&quot;);</span><br><span class="line">        console.log(&#x27;内容&#x27;);</span><br><span class="line">        console.log(&#x27;内容&#x27;);</span><br><span class="line">        console.log(&#x27;内容&#x27;);</span><br><span class="line">    console.groupEnd();</span><br><span class="line">console.groupEnd();</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<blockquote>
<p>表格输出</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">var Obj = &#123;</span><br><span class="line">    Obj1: &#123;</span><br><span class="line">        a: &quot;aaa&quot;,</span><br><span class="line">        b: &quot;bbb&quot;,</span><br><span class="line">        c: &quot;ccc&quot;</span><br><span class="line">    &#125;,</span><br><span class="line">    Obj2: &#123;</span><br><span class="line">        a: &quot;aaa&quot;,</span><br><span class="line">        b: &quot;bbb&quot;,</span><br><span class="line">        c: &quot;ccc&quot;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">var Arr = [</span><br><span class="line">    [&quot;aa&quot;,&quot;bb&quot;,&quot;cc&quot;],</span><br><span class="line">    [&quot;dd&quot;,&quot;ee&quot;,&quot;ff&quot;],</span><br><span class="line">    [&quot;gg&quot;,&quot;hh&quot;,&quot;ii&quot;],</span><br><span class="line">]</span><br><span class="line">console.table(Obj);</span><br><span class="line">console.table(Arr);</span><br></pre></td></tr></table></figure>

<blockquote>
<p>追踪堆栈调用</p>
</blockquote>
<pre><code>console.trace(&#39;调用&#39;)
</code></pre>
<blockquote>
<p>计时</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">console.time(&quot;Chrome中循环1000次的时间&quot;);</span><br><span class="line">for(var i = 0; i &lt; 1000; i++)</span><br><span class="line">&#123;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line">console.timeEnd(&quot;Chrome中循环1000次的时间&quot;);</span><br></pre></td></tr></table></figure>
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